Repair of a 1970s HP calculator: HP 27

I bought this one in college and would like to keep it working. When using it on a fully charged battery the display (seemingly randomly) displays blinking digits (zeroes?) across the display and then goes blank. I have purchased two replacement batteries for it, but that has not solved the problem. Help me keep this old lady going! Thanks.

Hi the chances are the board has got damp at some point causing it to short the only chance you have of saving the calculater is to remove the case and clean any parts of the board that look coroded but even doing this might not get it working as some part could be damaged and their is no way of replacing these parts also check battery terminals are free from corosion

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You can't charge the calculator off the solar power panel. The solar power panel merely conserves battery power when using the calculator in a bright environment. Try putting in a new battery and see whether the calculator turns on.

Hello,
The draining of batteries depends on usage. Turn calculator off when not in use. Use rechargeable batteries: Have two sets of them and change batteries before the ones in use are not fully discharged.
If you get tired of that, I suggest you have the calculator repaired.

I suggest you use rechargeable batteries. They usually drain faster than the alcaline ones anyway.So have 2 sets of rechargeable batteries. Evaluate the number of days a set lasts. Insert the charged batteries before the old ones are thourougly drained.

The life of your batteries in the calculator depends on the usage.

About repairs: I am convinced that it will cost you more to have it fixed than to buy a new HP calculator (HP 49g*'s, HP 50g* 's).

This is going to sound super dumb put leave it in a bowl of rice for a couple days. Rice will obsorbe the water. Also, change all five of the batteries(the 4 AAA ones and the back up battery). And if that doesn't work, you're pretty much out of luck. However, don't rush to the store and buy a new calculator. If you're in college or know someone that is in college, do what I do. Go to a math or sicence lab professor and ask them for a calculator at the end of the semester. I'm getting a new 89 pretty soon and i'm kinda excited. Good luck with your calculator